1 files changed, 237 insertions, 0 deletions
diff --git a/Source/WebCore/css/MediaQueryExpression.cpp b/Source/WebCore/css/MediaQueryExpression.cpp
new file mode 100644
index 000000000..91eb30452
--- /dev/null
+++ b/Source/WebCore/css/MediaQueryExpression.cpp
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "MediaQueryExpression.h"
+
+#include "CSSAspectRatioValue.h"
+#include "CSSParser.h"
+#include "CSSParserIdioms.h"
+#include "CSSParserToken.h"
+#include "CSSPrimitiveValue.h"
+#include "CSSValueList.h"
+#include "MediaFeatureNames.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+static inline bool featureWithValidIdent(const AtomicString& mediaFeature)
+{
+    return mediaFeature == MediaFeatureNames::orientation
+#if ENABLE(VIEW_MODE_CSS_MEDIA)
+    || mediaFeature == MediaFeatureNames::viewMode
+#endif
+    || mediaFeature == MediaFeatureNames::colorGamut
+    || mediaFeature == MediaFeatureNames::anyHover
+    || mediaFeature == MediaFeatureNames::anyPointer
+    || mediaFeature == MediaFeatureNames::hover
+    || mediaFeature == MediaFeatureNames::invertedColors
+    || mediaFeature == MediaFeatureNames::pointer
+    || mediaFeature == MediaFeatureNames::prefersReducedMotion;
+}
+
+static inline bool featureWithValidDensity(const String& mediaFeature, const CSSParserToken& token)
+{
+    if (!CSSPrimitiveValue::isResolution(static_cast<CSSPrimitiveValue::UnitType>(token.unitType())) || token.numericValue() <= 0)
+        return false;
+    
+    return mediaFeature == MediaFeatureNames::resolution
+    || mediaFeature == MediaFeatureNames::minResolution
+    || mediaFeature == MediaFeatureNames::maxResolution;
+}
+
+static inline bool featureWithValidPositiveLength(const String& mediaFeature, const CSSParserToken& token)
+{
+    if (!(CSSPrimitiveValue::isLength(token.unitType()) || (token.type() == NumberToken && !token.numericValue())) || token.numericValue() < 0)
+        return false;
+    
+    
+    return mediaFeature == MediaFeatureNames::height
+    || mediaFeature == MediaFeatureNames::maxHeight
+    || mediaFeature == MediaFeatureNames::minHeight
+    || mediaFeature == MediaFeatureNames::width
+    || mediaFeature == MediaFeatureNames::maxWidth
+    || mediaFeature == MediaFeatureNames::minWidth
+    || mediaFeature == MediaFeatureNames::deviceHeight
+    || mediaFeature == MediaFeatureNames::maxDeviceHeight
+    || mediaFeature == MediaFeatureNames::minDeviceHeight
+    || mediaFeature == MediaFeatureNames::deviceWidth
+    || mediaFeature == MediaFeatureNames::minDeviceWidth
+    || mediaFeature == MediaFeatureNames::maxDeviceWidth;
+}
+
+static inline bool featureWithPositiveInteger(const String& mediaFeature, const CSSParserToken& token)
+{
+    if (token.numericValueType() != IntegerValueType || token.numericValue() < 0)
+        return false;
+    
+    return mediaFeature == MediaFeatureNames::color
+    || mediaFeature == MediaFeatureNames:: maxColor
+    || mediaFeature == MediaFeatureNames:: minColor
+    || mediaFeature == MediaFeatureNames::colorIndex
+    || mediaFeature == MediaFeatureNames::maxColorIndex
+    || mediaFeature == MediaFeatureNames::minColorIndex
+    || mediaFeature == MediaFeatureNames::monochrome
+    || mediaFeature == MediaFeatureNames::maxMonochrome
+    || mediaFeature == MediaFeatureNames::minMonochrome;
+}
+
+static inline bool featureWithPositiveNumber(const String& mediaFeature, const CSSParserToken& token)
+{
+    if (token.type() != NumberToken || token.numericValue() < 0)
+        return false;
+    
+    return mediaFeature == MediaFeatureNames::transform3d
+    || mediaFeature == MediaFeatureNames::devicePixelRatio
+    || mediaFeature == MediaFeatureNames::maxDevicePixelRatio
+    || mediaFeature == MediaFeatureNames::minDevicePixelRatio
+    || mediaFeature == MediaFeatureNames::transition
+    || mediaFeature == MediaFeatureNames::animation
+    || mediaFeature == MediaFeatureNames::transform2d;
+}
+
+static inline bool featureWithZeroOrOne(const String& mediaFeature, const CSSParserToken& token)
+{
+    if (token.numericValueType() != IntegerValueType || !(token.numericValue() == 1 || !token.numericValue()))
+        return false;
+    
+    return mediaFeature == MediaFeatureNames::grid;
+}
+
+static inline bool isAspectRatioFeature(const AtomicString& mediaFeature)
+{
+    return mediaFeature == MediaFeatureNames::aspectRatio
+        || mediaFeature == MediaFeatureNames::deviceAspectRatio
+        || mediaFeature == MediaFeatureNames::minAspectRatio
+        || mediaFeature == MediaFeatureNames::maxAspectRatio
+        || mediaFeature == MediaFeatureNames::minDeviceAspectRatio
+        || mediaFeature == MediaFeatureNames::maxDeviceAspectRatio;
+}
+
+static inline bool isFeatureValidWithoutValue(const AtomicString& mediaFeature)
+{
+    // Media features that are prefixed by min/max cannot be used without a value.
+    return mediaFeature == MediaFeatureNames::anyHover
+        || mediaFeature == MediaFeatureNames::anyPointer
+        || mediaFeature == MediaFeatureNames::monochrome
+        || mediaFeature == MediaFeatureNames::color
+        || mediaFeature == MediaFeatureNames::colorIndex
+        || mediaFeature == MediaFeatureNames::grid
+        || mediaFeature == MediaFeatureNames::height
+        || mediaFeature == MediaFeatureNames::width
+        || mediaFeature == MediaFeatureNames::deviceHeight
+        || mediaFeature == MediaFeatureNames::deviceWidth
+        || mediaFeature == MediaFeatureNames::orientation
+        || mediaFeature == MediaFeatureNames::aspectRatio
+        || mediaFeature == MediaFeatureNames::deviceAspectRatio
+        || mediaFeature == MediaFeatureNames::hover
+        || mediaFeature == MediaFeatureNames::transform2d
+        || mediaFeature == MediaFeatureNames::transform3d
+        || mediaFeature == MediaFeatureNames::transition
+        || mediaFeature == MediaFeatureNames::animation
+        || mediaFeature == MediaFeatureNames::invertedColors
+#if ENABLE(VIEW_MODE_CSS_MEDIA)
+        || mediaFeature == MediaFeatureNames::viewMode
+#endif
+        || mediaFeature == MediaFeatureNames::pointer
+        || mediaFeature == MediaFeatureNames::prefersReducedMotion
+        || mediaFeature == MediaFeatureNames::devicePixelRatio
+        || mediaFeature == MediaFeatureNames::resolution
+        || mediaFeature == MediaFeatureNames::videoPlayableInline;
+}
+
+MediaQueryExpression::MediaQueryExpression(const String& feature, const Vector<CSSParserToken, 4>& tokenList)
+    : m_mediaFeature(feature.convertToASCIILowercase())
+    , m_isValid(false)
+{
+    // Create value for media query expression that must have 1 or more values.
+    if (!tokenList.size() && isFeatureValidWithoutValue(m_mediaFeature)) {
+        // Valid, creates a MediaQueryExp with an 'invalid' MediaQueryExpValue
+        m_isValid = true;
+    } else if (tokenList.size() == 1) {
+        CSSParserToken token = tokenList.first();
+        if (token.type() == IdentToken) {
+            CSSValueID ident = token.id();
+            if (!featureWithValidIdent(m_mediaFeature))
+                return;
+            m_value = CSSPrimitiveValue::createIdentifier(ident);
+            m_isValid = true;
+        } else if (token.type() == NumberToken || token.type() == PercentageToken || token.type() == DimensionToken) {
+            // Check for numeric token types since it is only safe for these types to call numericValue.
+            if (featureWithValidDensity(m_mediaFeature, token)
+                || featureWithValidPositiveLength(m_mediaFeature, token)) {
+                // Media features that must have non-negative <density>, ie. dppx, dpi or dpcm,
+                // or Media features that must have non-negative <length> or number value.
+                m_value = CSSPrimitiveValue::create(token.numericValue(), (CSSPrimitiveValue::UnitType) token.unitType());
+                m_isValid = true;
+            } else if (featureWithPositiveInteger(m_mediaFeature, token)
+                || featureWithPositiveNumber(m_mediaFeature, token)
+                || featureWithZeroOrOne(m_mediaFeature, token)) {
+                // Media features that must have non-negative integer value,
+                // or media features that must have non-negative number value,
+                // or media features that must have (0|1) value.
+                m_value = CSSPrimitiveValue::create(token.numericValue(), CSSPrimitiveValue::UnitType::CSS_NUMBER);
+                m_isValid = true;
+            }
+        }
+    } else if (tokenList.size() == 3 && isAspectRatioFeature(m_mediaFeature)) {
+        // FIXME: <ratio> is supposed to allow whitespace around the '/'
+        // Applicable to device-aspect-ratio and aspect-ratio.
+        const CSSParserToken& numerator = tokenList[0];
+        const CSSParserToken& delimiter = tokenList[1];
+        const CSSParserToken& denominator = tokenList[2];
+        if (delimiter.type() != DelimiterToken || delimiter.delimiter() != '/')
+            return;
+        if (numerator.type() != NumberToken || numerator.numericValue() <= 0 || numerator.numericValueType() != IntegerValueType)
+            return;
+        if (denominator.type() != NumberToken || denominator.numericValue() <= 0 || denominator.numericValueType() != IntegerValueType)
+            return;
+        
+        m_value = CSSAspectRatioValue::create(numerator.numericValue(), denominator.numericValue());
+        m_isValid = true;
+    }
+}
+
+String MediaQueryExpression::serialize() const
+{
+    if (!m_serializationCache.isNull())
+        return m_serializationCache;
+
+    StringBuilder result;
+    result.append('(');
+    result.append(m_mediaFeature.convertToASCIILowercase());
+    if (m_value) {
+        result.appendLiteral(": ");
+        result.append(m_value->cssText());
+    }
+    result.append(')');
+
+    m_serializationCache = result.toString();
+    return m_serializationCache;
+}
+
+} // namespace